Combine beef, grated cheese, green pepper, egg and pepper with 1 teaspoon of salt.,______,Saute bacon in a heavy pan until fat melts.,Add beef balls and brown slowly on all sides. Add margarine and onion.,Add the other 1 teaspoon salt, tomatoes, tomato paste and sugar.,Simmer, as slowly as possible, for 2 hours.,Stir occasionally.,Pour over hot, drained spaghetti. Sprinkle with Parmesan cheese and serve with crisp salad and bread.